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(8 + 4√5) / -1
= -8 - 4√5
b. gabungan yang suka mat, ing, dan keduannya = 40-4 = 36
n(AuB) = n(A) +n(B) - n(AnB)
n(AnB) = n(A) + n(B) - n(AuB)
= 23 + 18 - 36
=5
Jadi yang suka keduanya 5 (jawab : A)